mmCalc is a user-friendly photography tool designed specifically for calculating focal lengths and crop factors. Available on iPhone, this free multimedia app allows users to input their focal length, sensor size, and maximum aperture to determine the 35mm equivalent of their camera setup. This feature is particularly useful for photographers who want to understand how different configurations will affect their images.

In addition to the basic calculations, mmCalc offers advanced options for crop factor calculations based on sensor sizes. Users can also perform custom calculations for various lens and sensor combinations, including support for medium format and large format sensors. With its straightforward interface and essential functionalities, mmCalc serves as a valuable resource for photographers seeking to enhance their understanding of focal lengths.